diff --git a/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/activities/FitnessActivity.java b/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/activities/FitnessActivity.java
index 1867cad..0087588 100644
--- a/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/activities/FitnessActivity.java
+++ b/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/activities/FitnessActivity.java
@@ -45,6 +45,7 @@ public class FitnessActivity extends RobotActivity implements RobotLifecycleCall
 
         GesturePath.Builder gesturePathBuilder = new GesturePath.Builder();
 
+        /* Generate a random path to test the tracking system */
         for ( int i = 0; i < 40; i++)
         {
             gesturePathBuilder.addVector(
diff --git a/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/components/PersonalMotionPreviewElement.java b/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/components/PersonalMotionPreviewElement.java
index 113bdc7..1601899 100644
--- a/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/components/PersonalMotionPreviewElement.java
+++ b/code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/components/PersonalMotionPreviewElement.java
@@ -22,13 +22,16 @@ import org.joml.Vector2f;
 import org.joml.Vector3f;
 import org.joml.Vector4f;
 
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+
 public class PersonalMotionPreviewElement extends View {
 
     private GesturePath[] paths;
     private MotionProcessor motionProcessor;
 
     private double pathTime = 0.0D; // The timestamp at which the path is currently at.
-    private double exerciseProgress = 0.0D; // The progress of the exercise. Ranges from 0 to 1.
+    private final AtomicInteger exerciseProgress = new AtomicInteger(0); // The progress of the exercise. Ranges from 0 to 1000.
 
     private QiContext qiContext;
 
@@ -86,7 +89,6 @@ public class PersonalMotionPreviewElement extends View {
         this.targetPath = new Path();
 
         this.startingTime = System.nanoTime(); // Set the last time to the current time
-        this.exerciseProgress = 0.0d;
 
         this.exercise = exercise;
         this.paths = exercise.getPath();
@@ -103,14 +105,14 @@ public class PersonalMotionPreviewElement extends View {
         this.qiContext = context;
         if ( this.motionProcessor != null )
             this.motionProcessor.stopListening();
+
         this.motionProcessor = new MotionProcessor();
         this.motionProcessor.startListening();
 
         // Handler that is called every time the motion processor receives new data.
         this.motionProcessor.setMotionDataEventHandler((processed, preprocessed, sampleIndex, sampleRate, deviceId) -> {
-            double progress = this.motionProcessor.getAverageError(this.paths[0], 0);
-            this.exerciseProgress = Math.min(1, Math.max(0, progress));
-            this.invalidate();
+            int progress = (int)this.motionProcessor.getError(this.paths[0], processed);
+            this.exerciseProgress.set(Math.min(1000, Math.max(0, progress)));
             Log.i("MotionProcessor", "Processed data: " + progress + " (" + preprocessed + ")");
         });
         saySomethingNice();
@@ -147,16 +149,18 @@ public class PersonalMotionPreviewElement extends View {
         // Draw target circle
         float targetRadius = (this.screenDimensions.x + this.screenDimensions.y) / 5.0f;
         canvas.drawCircle(this.screenDimensions.x / 2, this.screenDimensions.y / 2, targetRadius, this.targetPaint);
-        canvas.drawCircle(this.screenDimensions.x / 2, this.screenDimensions.y / 2, (float)(targetRadius * exerciseProgress), this.referencePaint);
+        canvas.drawCircle(this.screenDimensions.x / 2, this.screenDimensions.y / 2, (targetRadius * exerciseProgress.get()/1000.0f), this.referencePaint);
         referencePaint.setColor(
                 Color.argb(
                         255,
-                        (int)(255 * (1.0 - exerciseProgress)),
-                        (int)(255 * exerciseProgress),
+                        (int)(255 * (1.0 - exerciseProgress.get()/1000.0f)),
+                        (int)(255 * exerciseProgress.get()/1000.0f),
                         0
                 )
         );
 
+        this.invalidate();
+
         timePassed = (System.nanoTime() - startingTime) / 1E9D;
     }
 }